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like IGF-1 (which is identical in humans and cows and "causes cancer".
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The linked article doesn't say that. It says cells with the IGF-1
receptor, removed or blocked, can/will not become cancerous.
But it does not say that being exposed (or not) to IRS-1 protein has any bearing on turning cancerous, only body size. It also says other things dock with the IGF-1 receptor so I think your jumping to an unwarranted conclusion in blaming IRS-1.
